diff --git a/judge/jinja2/markdown/__init__.py b/judge/jinja2/markdown/__init__.py
index cf5ab15..e34f74a 100644
--- a/judge/jinja2/markdown/__init__.py
+++ b/judge/jinja2/markdown/__init__.py
@@ -85,5 +85,10 @@ def markdown(value, lazy_load=False):
             if img.get("src"):
                 img["data-src"] = img["src"]
                 img["src"] = ""
+        for img in soup.findAll("iframe"):
+            if img.get("src"):
+                img["data-src"] = img["src"]
+                img["src"] = ""
         html = str(soup)
+
     return '<div class="md-typeset">%s</div>' % html
diff --git a/resources/common.js b/resources/common.js
index 4b13c32..6100cb5 100644
--- a/resources/common.js
+++ b/resources/common.js
@@ -179,7 +179,10 @@ $(function () {
         $("[data-src]img").each(function() {
             $(this).attr("src", $(this).attr("data-src"));
         })
-    }, "500");
+        $("[data-src]iframe").each(function() {
+            $(this).attr("src", $(this).attr("data-src"));
+        })
+    }, "100");
 });
 
 if (!Date.now) {